Ecology | Week 2 Science Showdown!

A Texas Gulf Coast food web is shown in the picture. According to this food web, which organisms would the bobcat and diamondback rattlesnake compete for if the mouse population and swamp rabbit population decreased?

• Raccoon and Sparrow.

• Raccoon and Eastern cottontail rabbit.

• Sparrow and seeds.

• Sparrow and Eastern cottontail rabbit.

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The diagram represents a food web. The numerals I, II, III, and IV represent four nutritional levels within the community in which different species compete. When an organism in this web dies, the organic molecules in its body are finally broken down and made available for recycling by the action of organisms in level.

• I

• II

• III

• IV

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The diagram shown represents a portion of a food web in a Long Island ecosystem. The numbers show the concentration of DDT in parts per million (ppm) in the body tissues of the various organisms. What effect would the removal of the cormorant population have on the state of dynamic balance present in the food web?

• Populations of mud snails and blowfish would increase.

• Populations of ospreys and mergansers would decrease.

• Populations of fluke fish and eels would increase.

• Populations of eels and ospreys would decrease.

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A food web is shown. Which components of the food web are indicated by letters A, B, and C?

• A - primary consumers; B- producers; C-secondary consumers.

• A- producers; B- secondary consumers; C - decomposers.

• A- producers; B- primary consumers; C- secondary consumers.

• A- primary consumers; B- secondary consumers; C- producers.

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The diagram shown represents a food web. If an insecticide is used to destroy most of the leaf beetles, what will most likely be the effect on the food web?

• The population of large birds will die out.

• Leaf beetles will multiply rapidly, providing more food for small birds.

• Small birds will avoid poisoned insects by preying on frogs.

• The grasshopper population will have more available food.

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Base your answers on the food web, If the population of mice is reduced by disease, which will most likely occur in the food web?

• The cricket population will increase.

• The snake population will increase.

• The grasses will decrease.

• The deer population will decrease.

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Two of the herbivores represented in this food web are...

• Toads and Snakes

• Deer and Mice

• Wolves and Raccoons

• Grasshoppers and toads

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The diagram represents various levels of interaction between organisms in a prairie ecosystem. If the amount of carbon dioxide in the atmosphere were to decrease, which organism in the diagram would be one of the first affected by the change?

• Hawks

• Wheat

• Locusts

• Molds

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Which diagram shows the relationship that is most similar to that between humans and an athelete's foot fungus?

• E

• B

• C

• D

Base your answer on the key in the image. A small shrimp feeds on parasites on the skin of a marine fish. Which set of symbols represents the relationship between the fish and the other two organisms?

• A. + with shrimp ; - with parasite.

• B. - with shrimp ; 0 with parasite.

• C. 0 with shrimp; - with parasite.

• D. + with shrimp ; 0 with parasite.

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